why when its red at night its supposed to be sunny the next day?

Answer 1

Hi. Red means clear to the west, and since most (no all) weather moves west to east it's a good sign that tomorrow may be clear as well.

Answer 2

The sun sets in the west. Mainly our weather in the summer involves a westerly or South westerly wind. Our weather comes from the Atlantic to the west. That's the easy bit.

When the sun falls below the horizon, the light shines through the atmosphere and reflects on it. The red colour is from the light of the sun being diffracted through the atmosphere and appearing to us. We can therefore get an idea of wheat the weather will be the next day by the atmosphere in the west over the Atlantic - if its clear we will see a red sky. If its not there is probably cloud cover and we are likely to get that weather the next day (provided the wind is coming off the Atlantic).

This does not always work out, but often happens and so has become a saying we all know and often proves correct.

Answer 3

The 'red sky at night' rhyme is more than an old wives' tale though and has some meteorological foundation - in England at least.
To explain why we'll need to know why clouds sometimes appear red and how that may be used to predict the weather. Firstly, why do clouds often appear red in the morning and evening?
Sunlight is broken into the familiar rainbow spectrum of varying-wavelength colours as it passes through the atmosphere.
The blue/violet end of the spectrum is diverted more than the red/orange.(This is the same mechanism that causes us to see the sky as blue incidentally, but that's getting rather off our point)
When the sun is low in the sky, at dawn and dusk, sunlight travels through more atmosphere than at other times of day. The red wavelength is better able to go on a direct course and be reflected back off clouds, whereas the blue light is more scattered before reaching the cloud and is therefore less visible. So, we see the clouds as red as the light that is reaching them is primarily red.
...and how does that help predict the weather?
The weather in the UK comes from the west, i.e. the wind is primarily westerly.
The sun rises in the east and sets in the west.
If there is broken cloud in the morning we may look to the west and see red light reflecting back from the cloud, i.e. 'red sky in the morning'. As the clouds are coming towards us there must be a chance of rain, at least an increased chance compared with the cloudless period we had just enjoyed.
Likewise for 'red sky at night'. If we see red clouds in the evening they will be in the east and have already passed us by, giving a good chance of clear skies and fine weather ahead.

Answer 4

It's one of the old adages Red sky at night Shepherds and Sailors that have been handed down over thousands of years. Another you may have heard is.
When crows are not nesting on high,
Do not a Caravan (or Tent) to buy.
Apparently this means if crows have their nests low in the trees it's going to be unusually windy that summer.

Answer 5

One of the most known weather tidbits of antiquity is actually stated in the bible. Matthew 16:2 goes "You are good at reading the weather signs of the skies - red sky tonight means fair weather tomorrow; red sky in the morning means foul weather all day..."

Answer 6

Most weather moves in from the West. High pressure systems (which generally are fair weather) charge ions in the air giving them the red color from the refraction of sunlight. Lack of the red color indicates a low pressure system, generally associated with cloudy / foul weather.

Answer 7

Yes, it's in the bible, but I don't remember where right now. Red skies at night mean fair weather the next day.

Answer 8

All i know is the old saying:

Red sky at night, shepards delight,
red sky in the morning, shepards warning.

Answer 9

Red sky at night
Sailor's delight

Red sky in the morning
Sailor's take warning

Answer 10

Red sky at night,shepherd's delight
Red sky in the morning,the barns on fire